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In which processor does the control register and system management mode register first appeared?

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In which processor does the control register and system management mode register first appeared?

(a) 80386

(b) 80386SL

(c) 80386DX

(d) 80486

This question was posed to me in a national level competition.

My enquiry is from Features of Intel topic in division Embedded Processors of Embedded Systems

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Right choice is (b) 80386SL

For explanation: The control register and system management mode register has first appeared in 80386SL and later on succeeded by other processors. These registers can provide intelligent power control.

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